Intercooler Cover Gasket 121850-77021

Function and technical context

This gasket acts as a sealing element between the cover and the body of the intercooler (charge air aftercooler), hermetically sealing the passage of charged air from the turbocharger before it enters the intake manifold. The intercooler is a critical component of the supercharging system: it cools the air compressed by the turbo to increase its density and improve combustion performance. If this gasket loses its sealing capacity, pressure leaks occur in the intake circuit that directly reduce engine power, increase fuel consumption and can cause irregular combustion. Its correct condition is, therefore, essential to preserve the performance and reliability of the Yanmar turbodiesel engine.

When to replace this part?

The most common symptoms of deterioration of this gasket are progressive loss of power, excessive black or gray smoke from the exhaust, increased fuel consumption and, in some cases, a hiss or audible pressure loss in the intercooler area during acceleration. It is recommended to inspect the condition of the gasket at each seasonal inspection or each time the intercooler cover is removed for cleaning or maintenance of the intake system. Replacing it preventively when carrying out work on the aftercooler prevents breakdowns during navigation and guarantees that the turbodiesel always works under optimal intake pressure and temperature conditions.